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Abstract Investigation of ground deformation at different mining levels of metal mines may offer the decisions of delineating the scope of the surface movement and subsidence and safe production. In situ monitoring data on ground surface and in deep underground in the west part of Chengchao iron mine over the period of 8 years were collected and the regular pattern of ground deformation under different mining level were analyzed. When mining the levels of －290，－307.5 and 325，the roof stratum entered its initial caving stage. When mining the level of －342.5，the roof stratum entered the stage of the large amount of caving intermittently. When mining the level－358，the ground deformation was continuous and the ground subsidence funnel broadened homogeneously. When mining the level －375，the surrounding rock mass entered the stage of rapid outward extension，the boundary and movement line of ground deformation extended largely，the ground subsidence funnel in the footwall broadened unevenly in January 2010，and the ground movement showed catastrophe. When mining the level －395，the surrounding rock entered the stage of a slow deformation，and the boundary line and moving line extended a little. The ground deformation was still very severe in the subsidence areas of the footwall and appeared no tendency of ceasing
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2016, Vol. 35 
